You may be able to do this in the KnowledgeFlow somehow, not sure, but I would probably write a Groovy or Jython script and run it in the corresponding console (available from the Tools menu in the GUIChooser if you have the kfGroovy and tigerJython packages installed).

Cheers,
Eibe



---------- Forwarded message ----------
From: Rana Sms <rana.communication.ahmed@gmail.com>
To: "Weka machine learning workbench list." <wekalist@list.waikato.ac.nz>
Cc: rana@eri.sci.eg
Bcc: 
Date: Tue, 30 Jan 2018 18:54:46 +0200
Subject: Read folder of arff files
I have a folder of 100 arff file. And already built random forest model
How could i evaluate the performance of all these files automatically and make weka reads the arff folder serially without need to test each file individually?